
Most Zigbee devices work with the plugin. Some are optimized (or certified): the plugin has a configuration file for their model, so their widgets and behaviour are known and tested. The others are handled from what they report during pairing, which works for most Zigbee 3.0 devices.
Some optimized devices still need a specific setup: see the Devices specifics pages.
Conf/Local-Devices folder of the plugin. See Get devices well integrated with the plugin and Model name resolution and Conf/Local-Devices precedence.